Question 459266
The sum of "complementary" angles is 90 degrees.
.
Therefore,
(a+3) + (2a+6) = 90
solving for 'a':
a+3 + 2a+6 = 90
3a+9 = 90
3a = 81
a = 27
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since measure of angle 'a' is a+3:
a+3 = 27+3 = 30 degrees